DE3421587A1 - Apparatus for separating haze particles, fat particles and dust particles from an air stream - Google Patents

Abstract

In a housing (3) connected to a suction fan, the air stream is sucked in via an inlet (2) which is bordered by deflectors (4) converging at the top and is furnished with a cover (5) which on each inlet side having a channel profile (6) borders an air guide to a separating element, running parallel to the inlet, having separating surfaces; the separating element opens into the housing and is bordered by essentially zigzag-shaped walls (10) forming separating surfaces (10'), which walls meet at the top of the element; between these walls (10), a further wall (11) extends upwards from the bottom of the channel profile (6), which wall (11), with the first-mentioned walls (10), borders essentially zigzag-shaped flow channels; in addition, a feed device (12) for wetting liquid is provided in each case for the separating elements (8) and the cover (5), via which feeding devices the wetting liquid is uniformly distributed to all assigned separating surfaces, the slope of which is chosen so that the wetting liquid flows to the channel profile (6) without dropping off from the surfaces. <IMAGE>

Description

£ T: E-N; TA NVV A L} - £; ..;. 3 A 2 1 5 8 7

DR. ULRICH OSTERTAG DR. REINHARD OSTERTAG

EISENWEG 10. 7000 STUTTGART 70, TELEPHONE Ο711Λ7Ο6Θ43, CABLE: OSPAT

Device for separating vapor, fat and dust particles from an air stream

Applicant

Dipl.-Ing. Helmuth Romaner A - 5201 Waldprechtxng 7 9 Austria

priority

Federal Republic of Germany, G 83 21 475.5 of July 26, 1983

Attorney's file

1557.6

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_o Device for separating haze, fat and dust particles ΓΜ from an air stream
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The invention relates to a device for separating vapor, fat and dust particles from an air stream, with an elongated device connected to a suction fan . housing into which the air flow is sucked from the underside of the housing via an elongated inlet, the is limited by upwardly converging guide profiles, a cover for the inlet, which is on each inlet side with a channel profile an air duct to a separating element with separator running parallel to the inlet limited areas, the separation element opening into the housing.

In known vapor extraction devices, the exhaust air Passed through a separation chamber in which channel-shaped impact elements that form separation surfaces for cleaning the air limit a flow path with multiple deflections. These Separating element arrangements known in various designs have the particular disadvantage that the separating chamber The separated particles can only be cleaned with a great deal of effort, because the rinsing liquid provided for this purpose only cleans the bottom of the gutters. For example, there is the disadvantage of the extractor device known from AT-PS 35S.848 in that the particles in the grooves hit a liquid surface where they are to be deposited. In in practice, however, it has been found that the degree of separation of this device is too low. It can also cause pollution

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from above the -. "Fluid surface provided air circulation

¹ ^ steering profiles are not prevented, which over time co

^1-0 inevitably leads to a reduction in the passage cross-sections ^ j. for air flow leads.

In a separating device known from US Pat. No. 3,616,744 water mist is used to knock down the particles carried in the air stream. Besides that Even in this known embodiment, the structural solution only allows a low degree of separation, the exhaust air strongly humidified by the water mist distributed via spray nozzles, which leads to the formation of condensation in the duct network and in the fan chamber.

The invention is based on the object of avoiding the above-described deficiency of the known embodiment and of creating a separation device which is self-cleaning in a simple manner and offers high efficiency Section of essentially zigzag-shaped, mutually parallel, elongated separation surfaces forming walls is limited, which meet at the top of the element, that between these walls from the bottom of the channel profile another wall extends upwards, which is essentially parallel to the first mentioned Walls runs and delimited with these essentially zigzag-shaped flow channels and that in the region of the upper end of both the separating element and the cover a supply device for wetting liquid extending over the element length is provided, via which d The wetting liquid is evenly distributed on all assigned separation surfaces, EPOCOPY M

where the inclination dl-e "of these surfaces *; is chosen so ^ that the co wetting liquid flows to the channel profile without "from the

* -! Surfaces to drip off.

^ This cascade-like separator guarantees a high degree of separation and requires due to the wettability of all separation surfaces and the associated. Self- cleaning effect no maintenance. The air containing haze, dust and fat particles flows in several times. Changes of direction essentially vertically through the separator and cuts the particles on the separation surfaces, in particular at the flow deflection points. Preferably vjerden the air passes through s cross sections up to the exit of the separator-i element gradually decreased in order to increase the air speed j and thus effectively deflecting and separating even the smallest particles.

The feed device for the wetting liquid has preferably a perforated feed pipe and a distribution profile, which liquid with the adjacent separation surfaces exit gap limited, so that the separation surfaces according to the principle of adhesion over the entire surface with a top down uniformly thin film of liquid flowing at the bottom.

In a particularly advantageous embodiment of the separation device, the separation surfaces are under one At right angles or at an acute angle to each other and the transition edges rounded. This prevents tearing or Prevents the wetting film from dripping off the separation surfaces.

The wetting liquid flows, expediently from one Pulse generator controlled by an electrical control circuit,

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during or after your suction operation periodically only briefly over the cut-off surfaces. This will on the one hand oo

¹ ^ separated particles washed into the collecting channel and

^. on the other hand takes place through the principle of evaporative cooling

a cooling of the separator. This causes an additional cleaning effect by condensation of the exhaust air on the Absehe Idea surfaces. The supply of the wetting liquid, preferably Tap water can be supplied fully automatically via shut-off elements and pulse generators of an electrical control circuit can be controlled to enable maintenance-free operation of the device. It is possible to use the separator during suction operation with cool wetting liquid and after cooking operation with warm liquid to apply. The wetting liquid becomes common removed with the impurities via a drain pipe.

According to a further feature of the invention, the device is preferably in a flat ceiling with supply air outlet elements built-in, through which the inlet can be acted upon with a flow of incoming air. The guiding profiles of the inlet form a storage space, the lower surface of which is flush with the ceiling and a surrounding cover frame can be used of the housing form supply air slot nozzles, which are expediently designed with a high degree of induction. After this Venturi principle, preheated clean supply air is blown in tangential to the guide profiles' in order to use a laminar Boundary layer a pollutionMer guide profiles by the contaminated Avoid exhaust air, especially through fat, and at the same time increase the suction effect in the horizontal direction raise. It is also advantageous to use the separating device according to the invention via a fire protection device

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to be ^{controlled in:} iirancf ail by: .a, continuous O ₀ liquid flow a penetration of the flames in the

v— to effectively prevent exhaust air suction duct.

• <r Due to the automatic cleaning of the separation surfaces OO

any bacteria formation is effectively prevented. It is also possible to use the separator if necessary to apply disinfectant to a separate connection.

The invention is explained in more detail below using an exemplary embodiment with reference to the drawing, in which a schematic cross section of a separation device according to the invention is shown.

The separation device is installed, for example, in a suspended ceiling 1 so that its underside with the ceiling flees. The contaminated exhaust air is by means of a suction fan, not shown, over an elongated, after sucked up tapering inlet 2 of a device housing 3, which of two symmetrically arranged guide profiles is limited. The inlet 2 is covered by a roof-shaped cover profile 5, which is spaced from the free edges the guide profiles 4 is arranged and with one to the free upper end of each guide profile 4 adjoining channel profile 6 an air supply 7 to a separating element acting like a cascade 8 limited. The cover profile 5 is on the side 5 'facing the sense profile 6 with undulating elevations or longitudinal ribs 9 ″, which generate turbulence in the air flow in order to improve the separation The surface of the cover profile provided with the longitudinal ribs 9 ″ already acts as the first separation surface.

Each separation element connected to the cover profile 5 8 has a substantially vertical orientation and is in

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Section of zigzag-shaped walls 10

running baffle and separation surfaces 10 'for the air flow

limited, which are essentially parallel to one another

co ". Between the separation surfaces 10 ', a zigzag-shaped wall 11 extends upwards from the channel profile 6, which has separation surfaces 11' running essentially parallel to the separation surfaces 10 'and with these forms essentially vertical flow channels "are made of thermally conductive material and are preferably provided with a smooth coating or sanded.

In the area of the upper end of the roof-shaped cover profile 5 and the separating element 8 there is one each Provided over the length of the device extending supply device 12 for wetting liquid, which has a perforated Has feed pipe 13 and a distribution profile 14, which with the walls 10 'distribution column 15 forms. The mutual Angle of inclination of the individual separation surfaces 10 'or 11' to each other is chosen so that the liquid film from above flows downwards without tearing off at the transition edges, which are suitably rounded.

The distribution profile 14 for the wetting liquid in the separation element 8 is also with central passage openings 14 'provided for the wetting liquid so that it can also act on the wall 11.

Although in the preceding description the walls 10 'and 11 have been described as being essentially parallel to one another, in practice the mutual spacing of the walls is increasingly reduced over the length of the flow path of the separating element 8 in order to increase the flow velocity. ' _t

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The exhaust air "tri'tt: from the A ^ s-cheide element 8" or out

co the interior profile 6 in the space enclosed by the housing 3

* - * above the separation element 8 or the cover profile the end.

At the lower peripheral edge of the device housing 3 is a supply air supply channel formed by a cover frame 16 and extending around this is provided as a slot nozzle 17, oriented tangential to inlet 2, like this is indicated by an arrow.

When the device is in operation, the exhaust air that is sucked in flows into the inlet 2, from the cover profile 5 to both sides deflected and then flows through the separation elements 8, as illustrated by arrows. The air flow It hits the separation surfaces several times, on which the particles contained in the air flow are separated.

The separation surfaces are continuously or periodically exposed to the wetting liquid, e.g. water, whereby the impurities get into the inner profile 6 and out of this into a drain, not shown. Essential is the uniform cleaning of all separation surfaces, which is ensured by a corresponding inclination of the separation surfaces on which the impurities and the wetting liquid flow off without dripping off.

The clean supply air supplied through the slot nozzles 17, which flows over the guide profiles 4 ensures that they are not contaminated by fat particles or other deposits will.

The feed device for the wetting liquid has, for example, solenoid valves that can be acted upon by pulse generators of an electrical control circuit.

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Preferably is. ia the Vto / direction; ^ housing a as co temperature sensor 18 trained fire alarm device

^ ~ built in, which is in the control circuit and enables the CN

"^ ¹ " To flood the device via the supply device for the wetting liquid in the event of a fire.

It is understood that the embodiment explained above various modifications can be made within the scope of the general inventive concept.

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Claims (1)

Dipl.-Ing. Helmuts Romaner in A-5201 Waldprechting 79 (Salzburg, Austria) Claims: i, - device for separating vapor, fat and Dust particles from an air stream, with a housing connected to a suction fan, into which the air stream is sucked in from the underside of the housing via an inlet • which is limited by upwardly converging guide profiles is, a cover for the inlet, which on each inlet side with a channel profile to an air duct a separating element running parallel to the inlet Delimited separation surfaces, the separation element opening into the housing, characterized in that the separation element (8) of essentially zigzag-shaped in section in the vertical direction, essentially to one another parallel, elongated separation surfaces (10 ') forming walls (10) which meet at the top of the element that are between them Walls (10) from the bottom of the channel profile (6) another Wall (11) extends upwards, which is essentially parallel ■ runs to the first-mentioned walls (10) and is delimited by these essentially ζick-sack-shaped flow channels ·.! and that in the area of the upper end: "both of the separating element (8) as well as the cover (5) 0 * e one over CQ the element length extending feed device (12) for LO r- wetting liquid is provided through which the • <wetting liquid on all assigned separation surfaces CO is evenly distributed, the slope of these surfaces is chosen so that the wetting liquid flows to the channel profile (6) without dripping off the surfaces. 2. Apparatus according to claim 1, characterized in that the separation surfaces (5 ', 10', 11 ') under a right Are arranged at an angle or at an acute angle to one another and that the transition edges are rounded. 3. Apparatus according to claim 1 or 2, characterized in that the feed device (12) for the wetting liquid has a perforated feed pipe (13) and a distribution profile (14) which delimits the liquid outlet gap with the adjacent separation surfaces (5 ¹ ; 10 '). 4. Device according to one of claims 1 to 3 »characterized in that the separation surfaces (5 ¹ , 10 ', 11') forming profile walls (5» 10, 11) are made of thermally conductive material and preferably with a ground surface or surface coating are provided, and that all separation surfaces are continuous or periodic. can be exposed to cold or warm wetting liquid. 5. Device according to one of claims 1 "to 4, characterized in that it is built into a flat ceiling (1) with supply air outlet elements (17) through which the Inlet (2) can be acted upon with a supply air stream. ₂ _ 6. Device according to claim ""} ', characterized in that that a circumferential cover frame (16) of the housing (3) is in front of T ~ is seen, which is designed as a supply air slot nozzle (17). p-j 7 device according to one of claims 1 "to 6, characterized in that the cover (5) is arranged at a mutual spacing and is essentially wave-shaped Has longitudinal ribs (9) which protrude into the air flow. 8. Device according to one of claims 1 "to 7» characterized in that a temperature sensing device (18) acting as a fire alarm device in the housing (3) is installed, via which an electrical control circuit of the feed device (12) for the wetting liquid in the Can be actuated in the sense of flooding the device. EPO COPY vs.